Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7833738 | Applied Surface Science | 2018 | 7 Pages |
Abstract
SiC nanowires (SiCnws) were incorporated in supercritical-ethanol-dried graphene aerogel (GA-S) via chemical vapor infiltration (CVI) to fabricate a lightweight, thermostable, high-performance electromagnetic (EM) absorbing composite. The SiCnws improved the yield strength of GA-S from 0.15â¯MPa to 0.47â¯MPa in the linear elastic region. The oxidation temperature of GA-S contained in situ grown SiCnw exceeded 660â¯Â°C in air. The double-scale surface roughness increases the water contact angle from 53° of GA-S to 134° of SiCnw/GA-S. The SiCnw/GA-S composite showed a minimum EM wave reflection loss (RL) value of â54.8â¯dB at 5.3â¯GHz with thickness of 3.63â¯mm. The SiCnw/GA-S sample demonstrated a wide effective absorbing bandwidth of 6.5â¯GHz from 9.3 to 15.8â¯GHz at thickness of 2.0â¯mm. In addition, the SiCnw/GA-S sample could achieve effective absorption covering the entire X-band in a wide thickness range of 2.2-2.7â¯mm. Three-dimensional networks and residual oxygen functional groups of GA-S, the high-density stacking faults, and the abundant interfaces between SiCnws and graphene sheets played important roles in enhancing the EM dissipation of SiCnw/GA-S composites. The SiCnw/GA-S composites are promising EM-wave-absorbing materials in extreme environment.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
Yehong Cheng, Mingyi Tan, Ping Hu, Xinghong Zhang, Boqian Sun, Liwen Yan, Shanbao Zhou, Wenbo Han,